LuaState: Fixed untracking references.

One thread may untrack a ref while another thread was closing the LuaState, which had emptied the tracked refs.

src/Bindings/LuaState.cpp

@@ -2288,15 +2288,17 @@ void cLuaState::UntrackRef(cTrackedRef & a_Ref)
 		return;
 	}
 
-	// Remove the callback:
+	// Remove the callback (note that another thread may have cleared the callbacks by closing the LuaState):
 	cCSLock Lock(canonState->m_CSTrackedRefs);
 	auto & trackedRefs = canonState->m_TrackedRefs;
-	trackedRefs.erase(std::remove_if(trackedRefs.begin(), trackedRefs.end(),
-		[&a_Ref](cTrackedRef * a_StoredRef)
+	for (auto itr = trackedRefs.begin(), end = trackedRefs.end(); itr != end; ++itr)
+	{
+		if (*itr == &a_Ref)
 		{
-			return (a_StoredRef == &a_Ref);
+			trackedRefs.erase(itr);
+			break;
 		}
-	));
+	}
 }
 
 

src/Bindings/LuaState.h

@@ -522,7 +522,8 @@ public:
 	/** Allows this object to be used in the same way as a lua_State *, for example in the LuaLib functions */
 	operator lua_State * (void) { return m_LuaState; }
 
-	/** Creates the m_LuaState, if not closed already. This state will be automatically closed in the destructor.
+	/** Creates the m_LuaState, if not created already.
+	This state will be automatically closed in the destructor.
 	The regular Lua libs are registered, but the MCS API is not registered (so that Lua can be used as
 	lite-config as well), use RegisterAPILibs() to do that. */
 	void Create(void);